61211611216 has 20 divisors (see below), whose sum is σ = 135539996512. Its totient is φ = 26233547616.

The previous prime is 61211611183. The next prime is 61211611243.

61211611216 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×61211611216² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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, 273266010 + ... + 273266233.

Almost surely, 2^61211611216 is an apocalyptic number.

It is an amenable number.

61211611216 is an abundant number, since it is smaller than the sum of its proper divisors (74328385296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61211611216 is a wasteful number, since it uses less digits than its factorization.

61211611216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546532258 (or 546532252 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The spelling of 61211611216 in words is "sixty-one billion, two hundred eleven million, six hundred eleven thousand, two hundred sixteen".