42087551337981 has 64 divisors (see below), whose sum is σ = 64963597570560. Its totient is φ = 26905350044160.

The previous prime is 42087551337971. The next prime is 42087551338039. The reversal of 42087551337981 is 18973315578024.

It is a happy number.

42087551337981 is a `hidden beast` number, since 4 + 2 + 0 + 8 + 7 + 5 + 513 + 37 + 9 + 81 = 666.

It is not a de Polignac number, because 42087551337981 - 2¹⁴ = 42087551321597 is a prime.

It is a super-2 number, since 2×42087551337981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42087551337901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189766105 + ... + 189987761.

It is an arithmetic number, because the mean of its divisors is an integer number (1015056212040).

Almost surely, 2^{42087551337981} is an apocalyptic number.

It is an amenable number.

42087551337981 is a deficient number, since it is larger than the sum of its proper divisors (22876046232579).

42087551337981 is a wasteful number, since it uses less digits than its factorization.

42087551337981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224451 (or 224445 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 42087551337981 in words is "forty-two trillion, eighty-seven billion, five hundred fifty-one million, three hundred thirty-seven thousand, nine hundred eighty-one".