155668490 has 16 divisors (see below), whose sum is σ = 296686152. Its totient is φ = 58604544.

The previous prime is 155668489. The next prime is 155668493. The reversal of 155668490 is 94866551.

155668490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 152942689 + 2725801 = 12367^2 + 1651^2 .

It is not an unprimeable number, because it can be changed into a prime (155668493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457679 + ... + 458018.

Almost surely, 2^155668490 is an apocalyptic number.

155668490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155668490 is a deficient number, since it is larger than the sum of its proper divisors (141017662).

155668490 is a wasteful number, since it uses less digits than its factorization.

155668490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915721.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 155668490 is about 12476.7179177859. The cubic root of 155668490 is about 537.9396683819.

The spelling of 155668490 in words is "one hundred fifty-five million, six hundred sixty-eight thousand, four hundred ninety".