1975515556 has 72 divisors (see below), whose sum is σ = 4091585400. Its totient is φ = 832043520.

The previous prime is 1975515541. The next prime is 1975515559. The reversal of 1975515556 is 6555155791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 291726400 + 1683789156 = 17080^2 + 41034^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (1975515559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4692226 + ... + 4692646.

It is an arithmetic number, because the mean of its divisors is an integer number (56827575).

Almost surely, 2^1975515556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1975515556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2045792700).

1975515556 is an abundant number, since it is smaller than the sum of its proper divisors (2116069844).

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

1975515556 is a wasteful number, since it uses less digits than its factorization.

1975515556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797 (or 788 counting only the distinct ones).

The product of its digits is 1181250, while the sum is 49.

The square root of 1975515556 is about 44446.7721662665. The cubic root of 1975515556 is about 1254.7585141943.

The spelling of 1975515556 in words is "one billion, nine hundred seventy-five million, five hundred fifteen thousand, five hundred fifty-six".