1978855531524 has 135 divisors (see below), whose sum is σ = 5347498298373. Its totient is φ = 638087284800.

The previous prime is 1978855531463. The next prime is 1978855531579. The reversal of 1978855531524 is 4251355588791.

The square root of 1978855531524 is 1406718.

It is a perfect power (a square), and thus also a powerful number.

1978855531524 is a `hidden beast` number, since 1 + 9 + 7 + 8 + 8 + 55 + 53 + 1 + 524 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1569585924 + 1977285945600 = 39618^2 + 1406160^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 784947384 + ... + 784949904.

Almost surely, 2^{1978855531524} is an apocalyptic number.

1978855531524 is the 1406718-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978855531524

1978855531524 is an abundant number, since it is smaller than the sum of its proper divisors (3368642766849).

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

1978855531524 is an frugal number, since it uses more digits than its factorization.

1978855531524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120 (or 2557 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 63.

The spelling of 1978855531524 in words is "one trillion, nine hundred seventy-eight billion, eight hundred fifty-five million, five hundred thirty-one thousand, five hundred twenty-four".