155478615555 has 64 divisors (see below), whose sum is σ = 269963559936. Its totient is φ = 76101120000.

The previous prime is 155478615493. The next prime is 155478615563. The reversal of 155478615555 is 555516874551.

It is not a de Polignac number, because 155478615555 - 2¹² = 155478611459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155478615495 and 155478615504.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38378280 + ... + 38382330.

It is an arithmetic number, because the mean of its divisors is an integer number (4218180624).

Almost surely, 2^155478615555 is an apocalyptic number.

155478615555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155478615555 is a deficient number, since it is larger than the sum of its proper divisors (114484944381).

155478615555 is a wasteful number, since it uses less digits than its factorization.

155478615555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788.

The product of its digits is 21000000, while the sum is 57.

The spelling of 155478615555 in words is "one hundred fifty-five billion, four hundred seventy-eight million, six hundred fifteen thousand, five hundred fifty-five".