10661615579 has 2 divisors, whose sum is σ = 10661615580. Its totient is φ = 10661615578.

The previous prime is 10661615543. The next prime is 10661615623. The reversal of 10661615579 is 97551616601.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10661615579 - 2⁸ = 10661615323 is a prime.

It is a super-2 number, since 2×10661615579² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10661615509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330807789 + 5330807790.

It is an arithmetic number, because the mean of its divisors is an integer number (5330807790).

Almost surely, 2^10661615579 is an apocalyptic number.

10661615579 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661615579 is an equidigital number, since it uses as much as digits as its factorization.

10661615579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 47.

The spelling of 10661615579 in words is "ten billion, six hundred sixty-one million, six hundred fifteen thousand, five hundred seventy-nine".