155401278039 has 12 divisors (see below), whose sum is σ = 256535443216. Its totient is φ = 88800730272.

The previous prime is 155401278031. The next prime is 155401278083. The reversal of 155401278039 is 930872104551.

155401278039 is a `hidden beast` number, since 1 + 5 + 540 + 1 + 2 + 78 + 0 + 39 = 666.

It is not a de Polignac number, because 155401278039 - 2³ = 155401278031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155401277985 and 155401278003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155401278031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1233343414 + ... + 1233343539.

Almost surely, 2^155401278039 is an apocalyptic number.

155401278039 is a deficient number, since it is larger than the sum of its proper divisors (101134165177).

155401278039 is a wasteful number, since it uses less digits than its factorization.

155401278039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466686966 (or 2466686963 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 155401278039 in words is "one hundred fifty-five billion, four hundred one million, two hundred seventy-eight thousand, thirty-nine".