1020125555 has 16 divisors (see below), whose sum is σ = 1285533504. Its totient is φ = 775632000.

The previous prime is 1020125549. The next prime is 1020125563. The reversal of 1020125555 is 5555210201.

It is not a de Polignac number, because 1020125555 - 2²⁰ = 1019076979 is a prime.

It is a super-2 number, since 2×1020125555² = 2081312295928116050, which contains 22 as substring.

It is a Duffinian number.

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, 10196 + ... + 46305.

It is an arithmetic number, because the mean of its divisors is an integer number (80345844).

Almost surely, 2^1020125555 is an apocalyptic number.

1020125555 is a deficient number, since it is larger than the sum of its proper divisors (265407949).

1020125555 is a wasteful number, since it uses less digits than its factorization.

1020125555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56686.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1020125555 is about 31939.4044246288. The cubic root of 1020125555 is about 1006.6640106480.

Adding to 1020125555 its reverse (5555210201), we get a palindrome (6575335756).

The spelling of 1020125555 in words is "one billion, twenty million, one hundred twenty-five thousand, five hundred fifty-five".