19877594652 has 18 divisors (see below), whose sum is σ = 50246142128. Its totient is φ = 6625864872.

The previous prime is 19877594647. The next prime is 19877594683. The reversal of 19877594652 is 25649577891.

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

It is a super-2 number, since 2×19877594652² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19877594652.

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, 276077668 + ... + 276077739.

Almost surely, 2^19877594652 is an apocalyptic number.

19877594652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19877594652 is an abundant number, since it is smaller than the sum of its proper divisors (30368547476).

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

19877594652 is a wasteful number, since it uses less digits than its factorization.

19877594652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552155417 (or 552155412 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 63.

The spelling of 19877594652 in words is "nineteen billion, eight hundred seventy-seven million, five hundred ninety-four thousand, six hundred fifty-two".