161500010651 has 4 divisors (see below), whose sum is σ = 184571440752. Its totient is φ = 138428580552.

The previous prime is 161500010647. The next prime is 161500010671. The reversal of 161500010651 is 156010005161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156010005161 = 9739 ⋅16019099.

It is a cyclic number.

It is not a de Polignac number, because 161500010651 - 2² = 161500010647 is a prime.

It is a super-2 number, since 2×161500010651² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161500010651.

It is not an unprimeable number, because it can be changed into a prime (161500010641) 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, 11535715040 + ... + 11535715053.

It is an arithmetic number, because the mean of its divisors is an integer number (46142860188).

Almost surely, 2^161500010651 is an apocalyptic number.

161500010651 is a deficient number, since it is larger than the sum of its proper divisors (23071430101).

161500010651 is an equidigital number, since it uses as much as digits as its factorization.

161500010651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23071430100.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 161500010651 in words is "one hundred sixty-one billion, five hundred million, ten thousand, six hundred fifty-one".