745778021641 has 8 divisors (see below), whose sum is σ = 749025576000. Its totient is φ = 742534779792.

The previous prime is 745778021633. The next prime is 745778021657. The reversal of 745778021641 is 146120877547.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745778021641 - 2³ = 745778021633 is a prime.

It is a super-3 number, since 3×745778021641³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745778021621) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 731266 + ... + 1423483.

It is an arithmetic number, because the mean of its divisors is an integer number (93628197000).

Almost surely, 2^745778021641 is an apocalyptic number.

It is an amenable number.

745778021641 is a deficient number, since it is larger than the sum of its proper divisors (3247554359).

745778021641 is a wasteful number, since it uses less digits than its factorization.

745778021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156255.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 745778021641 in words is "seven hundred forty-five billion, seven hundred seventy-eight million, twenty-one thousand, six hundred forty-one".