1994699511264 has 24 divisors (see below), whose sum is σ = 5236086217320. Its totient is φ = 664899837056.

The previous prime is 1994699511197. The next prime is 1994699511281. The reversal of 1994699511264 is 4621159964991.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1994699511264² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1994699511195 and 1994699511204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10389059859 + ... + 10389060050.

It is an arithmetic number, because the mean of its divisors is an integer number (218170259055).

Almost surely, 2^{1994699511264} is an apocalyptic number.

It is an amenable number.

1994699511264 is an abundant number, since it is smaller than the sum of its proper divisors (3241386706056).

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

1994699511264 is a wasteful number, since it uses less digits than its factorization.

1994699511264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20778119922 (or 20778119914 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 66.

The spelling of 1994699511264 in words is "one trillion, nine hundred ninety-four billion, six hundred ninety-nine million, five hundred eleven thousand, two hundred sixty-four".