7420685645 has 4 divisors (see below), whose sum is σ = 8904822780. Its totient is φ = 5936548512.

The previous prime is 7420685621. The next prime is 7420685669. The reversal of 7420685645 is 5465860247.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7420685621) and next prime (7420685669).

It can be written as a sum of positive squares in 2 ways, for example, as 5883810436 + 1536875209 = 76706^2 + 39203^2 .

It is a cyclic number.

It is not a de Polignac number, because 7420685645 - 2¹⁴ = 7420669261 is a prime.

It is a super-3 number, since 3×7420685645³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7420685645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742068560 + ... + 742068569.

It is an arithmetic number, because the mean of its divisors is an integer number (2226205695).

Almost surely, 2^7420685645 is an apocalyptic number.

It is an amenable number.

7420685645 is a deficient number, since it is larger than the sum of its proper divisors (1484137135).

7420685645 is a wasteful number, since it uses less digits than its factorization.

7420685645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484137134.

The product of its (nonzero) digits is 1612800, while the sum is 47.

The square root of 7420685645 is about 86143.4016335552. The cubic root of 7420685645 is about 1950.5092375918.

The spelling of 7420685645 in words is "seven billion, four hundred twenty million, six hundred eighty-five thousand, six hundred forty-five".