213663578877 has 48 divisors (see below), whose sum is σ = 370671832960. Its totient is φ = 116030952576.

The previous prime is 213663578833. The next prime is 213663578917. The reversal of 213663578877 is 778875366312.

213663578877 is a `hidden beast` number, since 2 + 136 + 6 + 357 + 88 + 77 = 666.

It is not a de Polignac number, because 213663578877 - 2¹¹ = 213663576829 is a prime.

It is a super-2 number, since 2×213663578877² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213663577877) 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, 965602 + ... + 1166067.

Almost surely, 2^213663578877 is an apocalyptic number.

It is an amenable number.

213663578877 is a deficient number, since it is larger than the sum of its proper divisors (157008254083).

213663578877 is a wasteful number, since it uses less digits than its factorization.

213663578877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131762 (or 2131759 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 63.

The spelling of 213663578877 in words is "two hundred thirteen billion, six hundred sixty-three million, five hundred seventy-eight thousand, eight hundred seventy-seven".