61798002638 has 4 divisors (see below), whose sum is σ = 92697003960. Its totient is φ = 30899001318.

The previous prime is 61798002601. The next prime is 61798002697. The reversal of 61798002638 is 83620089716.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15449500658 + ... + 15449500661.

It is an arithmetic number, because the mean of its divisors is an integer number (23174250990).

Almost surely, 2^61798002638 is an apocalyptic number.

61798002638 is a deficient number, since it is larger than the sum of its proper divisors (30899001322).

61798002638 is a wasteful number, since it uses less digits than its factorization.

61798002638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30899001321.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 61798002638 in words is "sixty-one billion, seven hundred ninety-eight million, two thousand, six hundred thirty-eight".