212986453778 has 18 divisors (see below), whose sum is σ = 371647600551. Its totient is φ = 91277950764.

The previous prime is 212986453751. The next prime is 212986453781. The reversal of 212986453778 is 877354689212.

It can be written as a sum of positive squares in only one way, i.e., 106493226889 + 106493226889 = 326333^2 + 326333^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=326333.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212986453778.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4545353 + ... + 4591971.

Almost surely, 2^212986453778 is an apocalyptic number.

212986453778 is a deficient number, since it is larger than the sum of its proper divisors (158661146773).

212986453778 is an frugal number, since it uses more digits than its factorization.

212986453778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93254 (or 46628 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 62.

The spelling of 212986453778 in words is "two hundred twelve billion, nine hundred eighty-six million, four hundred fifty-three thousand, seven hundred seventy-eight".