61898241254138 has 8 divisors (see below), whose sum is σ = 93245848413588. Its totient is φ = 30816291782944.

The previous prime is 61898241254107. The next prime is 61898241254153. The reversal of 61898241254138 is 83145214289816.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57751898684089 + 4146342570049 = 7599467^2 + 2036257^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66414421481 + ... + 66414422412.

Almost surely, 2^{61898241254138} is an apocalyptic number.

61898241254138 is a deficient number, since it is larger than the sum of its proper divisors (31347607159450).

61898241254138 is a wasteful number, since it uses less digits than its factorization.

61898241254138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132828844128.

The product of its digits is 26542080, while the sum is 62.

The spelling of 61898241254138 in words is "sixty-one trillion, eight hundred ninety-eight billion, two hundred forty-one million, two hundred fifty-four thousand, one hundred thirty-eight".