156661101116501 has 4 divisors (see below), whose sum is σ = 156674663685504. Its totient is φ = 156647538547500.

The previous prime is 156661101116393. The next prime is 156661101116539. The reversal of 156661101116501 is 105611101166651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156661101116501 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 (156661101116551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6781267175 + ... + 6781290276.

It is an arithmetic number, because the mean of its divisors is an integer number (39168665921376).

Almost surely, 2^{156661101116501} is an apocalyptic number.

It is an amenable number.

156661101116501 is a deficient number, since it is larger than the sum of its proper divisors (13562569003).

156661101116501 is a wasteful number, since it uses less digits than its factorization.

156661101116501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562569002.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 156661101116501 in words is "one hundred fifty-six trillion, six hundred sixty-one billion, one hundred one million, one hundred sixteen thousand, five hundred one".