61506157667671 has 4 divisors (see below), whose sum is σ = 61523887898200. Its totient is φ = 61488427437144.

The previous prime is 61506157667623. The next prime is 61506157667677. The reversal of 61506157667671 is 17676675160516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61506157667671 - 2¹⁷ = 61506157536599 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 8865110061 + ... + 8865116998.

It is an arithmetic number, because the mean of its divisors is an integer number (15380971974550).

Almost surely, 2^{61506157667671} is an apocalyptic number.

61506157667671 is a deficient number, since it is larger than the sum of its proper divisors (17730230529).

61506157667671 is a wasteful number, since it uses less digits than its factorization.

61506157667671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17730230528.

The product of its (nonzero) digits is 66679200, while the sum is 64.

The spelling of 61506157667671 in words is "sixty-one trillion, five hundred six billion, one hundred fifty-seven million, six hundred sixty-seven thousand, six hundred seventy-one".