61451435236 has 81 divisors (see below), whose sum is σ = 119798736379. Its totient is φ = 27573745408.

The previous prime is 61451435231. The next prime is 61451435249. The reversal of 61451435236 is 63253415416.

The square root of 61451435236 is 247894.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3793820836 + 57657614400 = 61594^2 + 240120^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61451435231) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 193852950 + ... + 193853266.

Almost surely, 2^61451435236 is an apocalyptic number.

61451435236 is the 247894-th square number.

It is an amenable number.

61451435236 is a deficient number, since it is larger than the sum of its proper divisors (58347301143).

61451435236 is a wasteful number, since it uses less digits than its factorization.

61451435236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 359 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The spelling of 61451435236 in words is "sixty-one billion, four hundred fifty-one million, four hundred thirty-five thousand, two hundred thirty-six".