61655720167 has 4 divisors (see below), whose sum is σ = 61658448696. Its totient is φ = 61652991640.

The previous prime is 61655720153. The next prime is 61655720197. The reversal of 61655720167 is 76102755616.

It is a happy number.

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 61655720167 - 2⁷ = 61655720039 is a prime.

It is a super-2 number, since 2×61655720167² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61655720117) 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, 1330084 + ... + 1375657.

It is an arithmetic number, because the mean of its divisors is an integer number (15414612174).

Almost surely, 2^61655720167 is an apocalyptic number.

61655720167 is a deficient number, since it is larger than the sum of its proper divisors (2728529).

61655720167 is a wasteful number, since it uses less digits than its factorization.

61655720167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728528.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 61655720167 in words is "sixty-one billion, six hundred fifty-five million, seven hundred twenty thousand, one hundred sixty-seven".