61221410757 has 12 divisors (see below), whose sum is σ = 95233305804. Its totient is φ = 37674714240.

The previous prime is 61221410749. The next prime is 61221410773. The reversal of 61221410757 is 75701412216.

61221410757 is a `hidden beast` number, since 612 + 21 + 4 + 10 + 7 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34192077921 + 27029332836 = 184911^2 + 164406^2 .

It is not a de Polignac number, because 61221410757 - 2³ = 61221410749 is a prime.

It is a super-2 number, since 2×61221410757² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221415757) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261629844 + ... + 261630077.

It is an arithmetic number, because the mean of its divisors is an integer number (7936108817).

Almost surely, 2^61221410757 is an apocalyptic number.

It is an amenable number.

61221410757 is a deficient number, since it is larger than the sum of its proper divisors (34011895047).

61221410757 is a wasteful number, since it uses less digits than its factorization.

61221410757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523259940 (or 523259937 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 61221410757 in words is "sixty-one billion, two hundred twenty-one million, four hundred ten thousand, seven hundred fifty-seven".