155406246165640 has 64 divisors (see below), whose sum is σ = 356577049249200. Its totient is φ = 60935599276032.

The previous prime is 155406246165637. The next prime is 155406246165659. The reversal of 155406246165640 is 46561642604551.

It can be written as a sum of positive squares in 8 ways, for example, as 22283063604036 + 133123182561604 = 4720494^2 + 11537902^2 .

It is a super-2 number, since 2×155406246165640² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30071017 + ... + 34857976.

Almost surely, 2^{155406246165640} is an apocalyptic number.

155406246165640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155406246165640 is an abundant number, since it is smaller than the sum of its proper divisors (201170803083560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155406246165640 is a wasteful number, since it uses less digits than its factorization.

155406246165640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64930186 (or 64930182 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 55.

The spelling of 155406246165640 in words is "one hundred fifty-five trillion, four hundred six billion, two hundred forty-six million, one hundred sixty-five thousand, six hundred forty".