161477999823 has 32 divisors (see below), whose sum is σ = 256878084096. Its totient is φ = 88220693088.

The previous prime is 161477999819. The next prime is 161477999827. The reversal of 161477999823 is 328999774161.

It is an interprime number because it is at equal distance from previous prime (161477999819) and next prime (161477999827).

It is not a de Polignac number, because 161477999823 - 2² = 161477999819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161477999827) 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, 990240 + ... + 1141722.

It is an arithmetic number, because the mean of its divisors is an integer number (8027440128).

Almost surely, 2^161477999823 is an apocalyptic number.

161477999823 is a deficient number, since it is larger than the sum of its proper divisors (95400084273).

161477999823 is a wasteful number, since it uses less digits than its factorization.

161477999823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153723.

The product of its digits is 41150592, while the sum is 66.

The spelling of 161477999823 in words is "one hundred sixty-one billion, four hundred seventy-seven million, nine hundred ninety-nine thousand, eight hundred twenty-three".