42420551640 has 64 divisors (see below), whose sum is σ = 127468136160. Its totient is φ = 11293793280.

The previous prime is 42420551627. The next prime is 42420551681. The reversal of 42420551640 is 4615502424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212431 + ... + 360510.

Almost surely, 2^42420551640 is an apocalyptic number.

42420551640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42420551640 is an abundant number, since it is smaller than the sum of its proper divisors (85047584520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42420551640 is a wasteful number, since it uses less digits than its factorization.

42420551640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573572 (or 573568 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

The spelling of 42420551640 in words is "forty-two billion, four hundred twenty million, five hundred fifty-one thousand, six hundred forty".