51642443547 has 6 divisors (see below), whose sum is σ = 74594640692. Its totient is φ = 34428295692.

The previous prime is 51642443519. The next prime is 51642443557. The reversal of 51642443547 is 74534424615.

51642443547 is a `hidden beast` number, since 5 + 1 + 64 + 2 + 4 + 43 + 547 = 666.

It is not a de Polignac number, because 51642443547 - 2¹⁴ = 51642427163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51642443507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2869024633 + ... + 2869024650.

Almost surely, 2^51642443547 is an apocalyptic number.

51642443547 is a deficient number, since it is larger than the sum of its proper divisors (22952197145).

51642443547 is a wasteful number, since it uses less digits than its factorization.

51642443547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5738049289 (or 5738049286 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 45.

The spelling of 51642443547 in words is "fifty-one billion, six hundred forty-two million, four hundred forty-three thousand, five hundred forty-seven".