79641042217490 has 64 divisors (see below), whose sum is σ = 154709107993440. Its totient is φ = 29343508070400.

The previous prime is 79641042217483. The next prime is 79641042217493. The reversal of 79641042217490 is 9471224014697.

It is a Cunningham number, because it is equal to 8924183²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 7385279102569 + 72255763114921 = 2717587^2 + 8500339^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79641042217493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121336190 + ... + 121990790.

Almost surely, 2^{79641042217490} is an apocalyptic number.

79641042217490 is a deficient number, since it is larger than the sum of its proper divisors (75068065775950).

79641042217490 is a wasteful number, since it uses less digits than its factorization.

79641042217490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656607.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 79641042217490 in words is "seventy-nine trillion, six hundred forty-one billion, forty-two million, two hundred seventeen thousand, four hundred ninety".