861053245551 has 24 divisors (see below), whose sum is σ = 1257448059504. Its totient is φ = 567718663680.

The previous prime is 861053245471. The next prime is 861053245567. The reversal of 861053245551 is 155542350168.

861053245551 is a `hidden beast` number, since 8 + 6 + 1 + 0 + 53 + 2 + 45 + 551 = 666.

It is not a de Polignac number, because 861053245551 - 2²⁷ = 860919027823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861053245497 and 861053245506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861053245051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 900181 + ... + 1591361.

It is an arithmetic number, because the mean of its divisors is an integer number (52393669146).

Almost surely, 2^861053245551 is an apocalyptic number.

861053245551 is a deficient number, since it is larger than the sum of its proper divisors (396394813953).

861053245551 is a wasteful number, since it uses less digits than its factorization.

861053245551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692711 (or 692708 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The spelling of 861053245551 in words is "eight hundred sixty-one billion, fifty-three million, two hundred forty-five thousand, five hundred fifty-one".