1979489772864 has 336 divisors, whose sum is σ = 6210202951680. Its totient is φ = 623434268160.

The previous prime is 1979489772863. The next prime is 1979489772877. The reversal of 1979489772864 is 4682779849791.

1979489772864 is a `hidden beast` number, since 1 + 9 + 7 + 9 + 489 + 7 + 72 + 8 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979489772863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113163159 + ... + 113180649.

It is an arithmetic number, because the mean of its divisors is an integer number (18482746880).

Almost surely, 2^{1979489772864} 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 1979489772864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3105101475840).

1979489772864 is an abundant number, since it is smaller than the sum of its proper divisors (4230713178816).

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

1979489772864 is a wasteful number, since it uses less digits than its factorization.

1979489772864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17920 (or 17898 counting only the distinct ones).

The product of its digits is 3072577536, while the sum is 81.

The spelling of 1979489772864 in words is "one trillion, nine hundred seventy-nine billion, four hundred eighty-nine million, seven hundred seventy-two thousand, eight hundred sixty-four".