42451899705881 has 4 divisors (see below), whose sum is σ = 42555694082100. Its totient is φ = 42348105329664.

The previous prime is 42451899705871. The next prime is 42451899705899. The reversal of 42451899705881 is 18850799815424.

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 32534942931481 + 9916956774400 = 5703941^2 + 3149120^2 .

It is a cyclic number.

It is not a de Polignac number, because 42451899705881 - 2²⁶ = 42451832597017 is a prime.

It is a super-2 number, since 2×42451899705881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42451899705871) 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, 51897187496 + ... + 51897188313.

It is an arithmetic number, because the mean of its divisors is an integer number (10638923520525).

Almost surely, 2^{42451899705881} is an apocalyptic number.

It is an amenable number.

42451899705881 is a deficient number, since it is larger than the sum of its proper divisors (103794376219).

42451899705881 is a wasteful number, since it uses less digits than its factorization.

42451899705881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103794376218.

The product of its (nonzero) digits is 232243200, while the sum is 71.

The spelling of 42451899705881 in words is "forty-two trillion, four hundred fifty-one billion, eight hundred ninety-nine million, seven hundred five thousand, eight hundred eighty-one".