13778515672 has 8 divisors (see below), whose sum is σ = 25834716900. Its totient is φ = 6889257832.

The previous prime is 13778515669. The next prime is 13778515747. The reversal of 13778515672 is 27651587731.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×13778515672³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861157222 + ... + 861157237.

Almost surely, 2^13778515672 is an apocalyptic number.

It is an amenable number.

13778515672 is a deficient number, since it is larger than the sum of its proper divisors (12056201228).

13778515672 is a wasteful number, since it uses less digits than its factorization.

13778515672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722314465 (or 1722314461 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 52.

The spelling of 13778515672 in words is "thirteen billion, seven hundred seventy-eight million, five hundred fifteen thousand, six hundred seventy-two".