61891402546 has 16 divisors (see below), whose sum is σ = 98680606776. Its totient is φ = 29012033536.

The previous prime is 61891402501. The next prime is 61891402619. The reversal of 61891402546 is 64520419816.

It is a happy number.

61891402546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 59127271921 + 2764130625 = 243161^2 + 52575^2 .

It is a super-2 number, since 2×61891402546² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61891402496 and 61891402505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3532771 + ... + 3550246.

Almost surely, 2^61891402546 is an apocalyptic number.

61891402546 is a deficient number, since it is larger than the sum of its proper divisors (36789204230).

61891402546 is a wasteful number, since it uses less digits than its factorization.

61891402546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083293.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 61891402546 in words is "sixty-one billion, eight hundred ninety-one million, four hundred two thousand, five hundred forty-six".