7442400661 has 4 divisors (see below), whose sum is σ = 7485420492. Its totient is φ = 7399380832.

The previous prime is 7442400649. The next prime is 7442400677. The reversal of 7442400661 is 1660042447.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2692572100 + 4749828561 = 51890^2 + 68919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7442400661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7442400601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21509656 + ... + 21510001.

It is an arithmetic number, because the mean of its divisors is an integer number (1871355123).

Almost surely, 2^7442400661 is an apocalyptic number.

It is an amenable number.

7442400661 is a deficient number, since it is larger than the sum of its proper divisors (43019831).

7442400661 is a wasteful number, since it uses less digits than its factorization.

7442400661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43019830.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 7442400661 is about 86269.3494875208. The cubic root of 7442400661 is about 1952.4099645512.

The spelling of 7442400661 in words is "seven billion, four hundred forty-two million, four hundred thousand, six hundred sixty-one".