42015542551 has 4 divisors (see below), whose sum is σ = 44487045072. Its totient is φ = 39544040032.

The previous prime is 42015542549. The next prime is 42015542557. The reversal of 42015542551 is 15524551024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42015542551 - 2¹ = 42015542549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42015542557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235751235 + ... + 1235751268.

It is an arithmetic number, because the mean of its divisors is an integer number (11121761268).

Almost surely, 2^42015542551 is an apocalyptic number.

42015542551 is a deficient number, since it is larger than the sum of its proper divisors (2471502521).

42015542551 is a wasteful number, since it uses less digits than its factorization.

42015542551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471502520.

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 42015542551 in words is "forty-two billion, fifteen million, five hundred forty-two thousand, five hundred fifty-one".