61558772067 has 32 divisors (see below), whose sum is σ = 98375567360. Its totient is φ = 37819781280.

The previous prime is 61558772047. The next prime is 61558772083. The reversal of 61558772067 is 76027785516.

It is a happy number.

61558772067 is a `hidden beast` number, since 6 + 1 + 558 + 7 + 7 + 20 + 67 = 666.

It is not a de Polignac number, because 61558772067 - 2⁸ = 61558771811 is a prime.

It is a super-3 number, since 3×61558772067³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61558772047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68592 + ... + 357522.

It is an arithmetic number, because the mean of its divisors is an integer number (3074236480).

Almost surely, 2^61558772067 is an apocalyptic number.

61558772067 is a deficient number, since it is larger than the sum of its proper divisors (36816795293).

61558772067 is a wasteful number, since it uses less digits than its factorization.

61558772067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289560 (or 289554 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 54.

The spelling of 61558772067 in words is "sixty-one billion, five hundred fifty-eight million, seven hundred seventy-two thousand, sixty-seven".