61262918879138 has 4 divisors (see below), whose sum is σ = 91894378318710. Its totient is φ = 30631459439568.

The previous prime is 61262918879131. The next prime is 61262918879147. The reversal of 61262918879138 is 83197881926216.

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

It can be written as a sum of positive squares in only one way, i.e., 31770774814249 + 29492144064889 = 5636557^2 + 5430667^2 .

It is not an unprimeable number, because it can be changed into a prime (61262918879131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15315729719783 + ... + 15315729719786.

Almost surely, 2^{61262918879138} is an apocalyptic number.

61262918879138 is a deficient number, since it is larger than the sum of its proper divisors (30631459439572).

61262918879138 is a wasteful number, since it uses less digits than its factorization.

61262918879138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30631459439571.

The product of its digits is 125411328, while the sum is 71.

The spelling of 61262918879138 in words is "sixty-one trillion, two hundred sixty-two billion, nine hundred eighteen million, eight hundred seventy-nine thousand, one hundred thirty-eight".