161506494276 has 48 divisors (see below), whose sum is σ = 402269736960. Its totient is φ = 50283707040.

The previous prime is 161506494271. The next prime is 161506494307. The reversal of 161506494276 is 672494605161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161506494271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4972276 + ... + 5004651.

It is an arithmetic number, because the mean of its divisors is an integer number (8380619520).

Almost surely, 2^161506494276 is an apocalyptic number.

It is an amenable number.

161506494276 is an abundant number, since it is smaller than the sum of its proper divisors (240763242684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161506494276 is a wasteful number, since it uses less digits than its factorization.

161506494276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977024 (or 9977022 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 161506494276 in words is "one hundred sixty-one billion, five hundred six million, four hundred ninety-four thousand, two hundred seventy-six".