155909490105 has 16 divisors (see below), whose sum is σ = 253178397504. Its totient is φ = 81910656960.

The previous prime is 155909490101. The next prime is 155909490127. The reversal of 155909490105 is 501094909551.

It is not a de Polignac number, because 155909490105 - 2² = 155909490101 is a prime.

It is a super-2 number, since 2×155909490105² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155909490101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77565906 + ... + 77567915.

It is an arithmetic number, because the mean of its divisors is an integer number (15823649844).

Almost surely, 2^155909490105 is an apocalyptic number.

155909490105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155909490105 is a deficient number, since it is larger than the sum of its proper divisors (97268907399).

155909490105 is a wasteful number, since it uses less digits than its factorization.

155909490105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155133896.

The product of its (nonzero) digits is 364500, while the sum is 48.

The spelling of 155909490105 in words is "one hundred fifty-five billion, nine hundred nine million, four hundred ninety thousand, one hundred five".