161618770 has 16 divisors (see below), whose sum is σ = 291138048. Its totient is φ = 64597680.

The previous prime is 161618767. The next prime is 161618833. The reversal of 161618770 is 77816161.

It is a super-2 number, since 2×161618770² = 52241253632625800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9217 + ... + 20203.

It is an arithmetic number, because the mean of its divisors is an integer number (18196128).

Almost surely, 2^161618770 is an apocalyptic number.

161618770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161618770 is a deficient number, since it is larger than the sum of its proper divisors (129519278).

161618770 is a wasteful number, since it uses less digits than its factorization.

161618770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12465.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 161618770 is about 12712.9371114625. The cubic root of 161618770 is about 544.7082241474.

The spelling of 161618770 in words is "one hundred sixty-one million, six hundred eighteen thousand, seven hundred seventy".