155642997 has 8 divisors (see below), whose sum is σ = 208020960. Its totient is φ = 103513520.

The previous prime is 155642989. The next prime is 155643013. The reversal of 155642997 is 799246551.

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

It is a cyclic number.

It is not a de Polignac number, because 155642997 - 2³ = 155642989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155642917) 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, 60654 + ... + 63167.

It is an arithmetic number, because the mean of its divisors is an integer number (26002620).

Almost surely, 2^155642997 is an apocalyptic number.

It is an amenable number.

155642997 is a deficient number, since it is larger than the sum of its proper divisors (52377963).

155642997 is a wasteful number, since it uses less digits than its factorization.

155642997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124243.

The product of its digits is 680400, while the sum is 48.

The square root of 155642997 is about 12475.6962531155. The cubic root of 155642997 is about 537.9103016068.

The spelling of 155642997 in words is "one hundred fifty-five million, six hundred forty-two thousand, nine hundred ninety-seven".