161231061456 has 30 divisors (see below), whose sum is σ = 451223040450. Its totient is φ = 53743687104.

The previous prime is 161231061449. The next prime is 161231061457. The reversal of 161231061456 is 654160132161.

161231061456 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 31 + 0 + 614 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 153206485056 + 8024576400 = 391416^2 + 89580^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161231061456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161231061457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 559829931 + ... + 559830218.

It is an arithmetic number, because the mean of its divisors is an integer number (15040768015).

Almost surely, 2^161231061456 is an apocalyptic number.

161231061456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161231061456 is an abundant number, since it is smaller than the sum of its proper divisors (289991978994).

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

161231061456 is a wasteful number, since it uses less digits than its factorization.

161231061456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119660163 (or 1119660154 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 161231061456 in words is "one hundred sixty-one billion, two hundred thirty-one million, sixty-one thousand, four hundred fifty-six".