155406246165613 has 4 divisors (see below), whose sum is σ = 155414225147260. Its totient is φ = 155398267183968.

The previous prime is 155406246165497. The next prime is 155406246165617. The reversal of 155406246165613 is 316561642604551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78397512852169 + 77008733313444 = 8854237^2 + 8775462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155406246165613 is a prime.

It is a super-2 number, since 2×155406246165613² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155406246165617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3989461608 + ... + 3989500561.

It is an arithmetic number, because the mean of its divisors is an integer number (38853556286815).

Almost surely, 2^{155406246165613} is an apocalyptic number.

It is an amenable number.

155406246165613 is a deficient number, since it is larger than the sum of its proper divisors (7978981647).

155406246165613 is an equidigital number, since it uses as much as digits as its factorization.

155406246165613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7978981646.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 155406246165613 in words is "one hundred fifty-five trillion, four hundred six billion, two hundred forty-six million, one hundred sixty-five thousand, six hundred thirteen".