61400399761 has 8 divisors (see below), whose sum is σ = 61650230760. Its totient is φ = 61150771968.

The previous prime is 61400399743. The next prime is 61400399783. The reversal of 61400399761 is 16799300416.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17145283600 + 44255116161 = 130940^2 + 210369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61400399761 - 2⁵ = 61400399729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61400399741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570105 + ... + 669193.

It is an arithmetic number, because the mean of its divisors is an integer number (7706278845).

Almost surely, 2^61400399761 is an apocalyptic number.

It is an amenable number.

61400399761 is a deficient number, since it is larger than the sum of its proper divisors (249830999).

61400399761 is a wasteful number, since it uses less digits than its factorization.

61400399761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101603.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 61400399761 in words is "sixty-one billion, four hundred million, three hundred ninety-nine thousand, seven hundred sixty-one".