42502023661 has 4 divisors (see below), whose sum is σ = 42717770172. Its totient is φ = 42286277152.

The previous prime is 42502023631. The next prime is 42502023671. The reversal of 42502023661 is 16632020524.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39089244100 + 3412779561 = 197710^2 + 58419^2 .

It is a cyclic number.

It is not a de Polignac number, because 42502023661 - 2¹⁹ = 42501499373 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 (42502023611) 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, 107872960 + ... + 107873353.

It is an arithmetic number, because the mean of its divisors is an integer number (10679442543).

Almost surely, 2^42502023661 is an apocalyptic number.

It is an amenable number.

42502023661 is a deficient number, since it is larger than the sum of its proper divisors (215746511).

42502023661 is a wasteful number, since it uses less digits than its factorization.

42502023661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215746510.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 42502023661 in words is "forty-two billion, five hundred two million, twenty-three thousand, six hundred sixty-one".