161610550 has 24 divisors (see below), whose sum is σ = 300947256. Its totient is φ = 64568640.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610550 is 55016161.

It is a super-2 number, since 2×161610550² = 52235939742605000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161610557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64114 + ... + 66586.

It is an arithmetic number, because the mean of its divisors is an integer number (12539469).

Almost surely, 2^161610550 is an apocalyptic number.

161610550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161610550 is a deficient number, since it is larger than the sum of its proper divisors (139336706).

161610550 is a wasteful number, since it uses less digits than its factorization.

161610550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 161610550 is about 12712.6138146331. The cubic root of 161610550 is about 544.6989892928.

The spelling of 161610550 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred fifty".