155996978 has 8 divisors (see below), whose sum is σ = 234748800. Its totient is φ = 77747380.

The previous prime is 155996941. The next prime is 155996983. The reversal of 155996978 is 879699551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124778 + ... + 126021.

It is an arithmetic number, because the mean of its divisors is an integer number (29343600).

Almost surely, 2^155996978 is an apocalyptic number.

155996978 is a deficient number, since it is larger than the sum of its proper divisors (78751822).

155996978 is a wasteful number, since it uses less digits than its factorization.

155996978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251112.

The product of its digits is 6123600, while the sum is 59.

The square root of 155996978 is about 12489.8750193907. The cubic root of 155996978 is about 538.3177851033.

The spelling of 155996978 in words is "one hundred fifty-five million, nine hundred ninety-six thousand, nine hundred seventy-eight".