61402682881 has 4 divisors (see below), whose sum is σ = 61552812100. Its totient is φ = 61252553664.

The previous prime is 61402682879. The next prime is 61402682893. The reversal of 61402682881 is 18828620416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51612569856 + 9790113025 = 227184^2 + 98945^2 .

It is a cyclic number.

It is not a de Polignac number, because 61402682881 - 2¹ = 61402682879 is a prime.

It is a super-2 number, since 2×61402682881² (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 (61402685881) 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, 75063996 + ... + 75064813.

It is an arithmetic number, because the mean of its divisors is an integer number (15388203025).

Almost surely, 2^61402682881 is an apocalyptic number.

It is an amenable number.

61402682881 is a deficient number, since it is larger than the sum of its proper divisors (150129219).

61402682881 is a wasteful number, since it uses less digits than its factorization.

61402682881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150129218.

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 61402682881 in words is "sixty-one billion, four hundred two million, six hundred eighty-two thousand, eight hundred eighty-one".