61155767938 has 8 divisors (see below), whose sum is σ = 97129749132. Its totient is φ = 28779184896.

The previous prime is 61155767903. The next prime is 61155767947. The reversal of 61155767938 is 83976755116.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50020664409 + 11135103529 = 223653^2 + 105523^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899349495 + ... + 899349562.

Almost surely, 2^61155767938 is an apocalyptic number.

61155767938 is a deficient number, since it is larger than the sum of its proper divisors (35973981194).

61155767938 is a wasteful number, since it uses less digits than its factorization.

61155767938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798699076.

The product of its digits is 9525600, while the sum is 58.

The spelling of 61155767938 in words is "sixty-one billion, one hundred fifty-five million, seven hundred sixty-seven thousand, nine hundred thirty-eight".