1578461798772 has 18 divisors (see below), whose sum is σ = 3990000658098. Its totient is φ = 526153932912.

The previous prime is 1578461798761. The next prime is 1578461798831. The reversal of 1578461798772 is 2778971648751.

1578461798772 is a `hidden beast` number, since 1 + 5 + 7 + 8 + 461 + 7 + 98 + 7 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1510155885456 + 68305913316 = 1228884^2 + 261354^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1578461798772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21923080503 + ... + 21923080574.

Almost surely, 2^{1578461798772} is an apocalyptic number.

1578461798772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1578461798772 is an abundant number, since it is smaller than the sum of its proper divisors (2411538859326).

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

1578461798772 is a wasteful number, since it uses less digits than its factorization.

1578461798772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43846161087 (or 43846161082 counting only the distinct ones).

The product of its digits is 331914240, while the sum is 72.

The spelling of 1578461798772 in words is "one trillion, five hundred seventy-eight billion, four hundred sixty-one million, seven hundred ninety-eight thousand, seven hundred seventy-two".