61811217610 has 8 divisors (see below), whose sum is σ = 111260191716. Its totient is φ = 24724487040.

The previous prime is 61811217577. The next prime is 61811217623. The reversal of 61811217610 is 1671211816.

It can be written as a sum of positive squares in 2 ways, for example, as 58371043201 + 3440174409 = 241601^2 + 58653^2 .

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

It is a super-2 number, since 2×61811217610² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090560871 + ... + 3090560890.

Almost surely, 2^61811217610 is an apocalyptic number.

61811217610 is a deficient number, since it is larger than the sum of its proper divisors (49448974106).

61811217610 is a wasteful number, since it uses less digits than its factorization.

61811217610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181121768.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 61811217610 in words is "sixty-one billion, eight hundred eleven million, two hundred seventeen thousand, six hundred ten".