61221410761 has 16 divisors (see below), whose sum is σ = 71084245248. Its totient is φ = 51640545600.

The previous prime is 61221410749. The next prime is 61221410773. The reversal of 61221410761 is 16701412216.

It is an interprime number because it is at equal distance from previous prime (61221410749) and next prime (61221410773).

It is not a de Polignac number, because 61221410761 - 2²⁷ = 61087193033 is a prime.

It is a super-2 number, since 2×61221410761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61221410461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155031 + ... + 382723.

It is an arithmetic number, because the mean of its divisors is an integer number (4442765328).

Almost surely, 2^61221410761 is an apocalyptic number.

It is an amenable number.

61221410761 is a deficient number, since it is larger than the sum of its proper divisors (9862834487).

61221410761 is a wasteful number, since it uses less digits than its factorization.

61221410761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228312.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 61221410761 its reverse (16701412216), we get a palindrome (77922822977).

The spelling of 61221410761 in words is "sixty-one billion, two hundred twenty-one million, four hundred ten thousand, seven hundred sixty-one".