61506157667672 has 8 divisors (see below), whose sum is σ = 115324045626900. Its totient is φ = 30753078833832.

The previous prime is 61506157667623. The next prime is 61506157667677. The reversal of 61506157667672 is 27676675160516.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 61506157667599 and 61506157667608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506157667677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3844134854222 + ... + 3844134854237.

Almost surely, 2^{61506157667672} is an apocalyptic number.

It is an amenable number.

61506157667672 is a deficient number, since it is larger than the sum of its proper divisors (53817887959228).

61506157667672 is a wasteful number, since it uses less digits than its factorization.

61506157667672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688269708465 (or 7688269708461 counting only the distinct ones).

The product of its (nonzero) digits is 133358400, while the sum is 65.

The spelling of 61506157667672 in words is "sixty-one trillion, five hundred six billion, one hundred fifty-seven million, six hundred sixty-seven thousand, six hundred seventy-two".