161503456 has 12 divisors (see below), whose sum is σ = 317959992. Its totient is φ = 80751712.

The previous prime is 161503453. The next prime is 161503457. The reversal of 161503456 is 654305161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161503453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2523460 + ... + 2523523.

It is an arithmetic number, because the mean of its divisors is an integer number (26496666).

Almost surely, 2^161503456 is an apocalyptic number.

161503456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161503456 is a deficient number, since it is larger than the sum of its proper divisors (156456536).

161503456 is an equidigital number, since it uses as much as digits as its factorization.

161503456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046993 (or 5046985 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 161503456 is about 12708.4010009127. The cubic root of 161503456 is about 544.5786446667.

The spelling of 161503456 in words is "one hundred sixty-one million, five hundred three thousand, four hundred fifty-six".