61545311666045 has 64 divisors (see below), whose sum is σ = 81277225818624. Its totient is φ = 44597731368960.

The previous prime is 61545311666009. The next prime is 61545311666051. The reversal of 61545311666045 is 54066611354516.

It is a happy number.

It is not a de Polignac number, because 61545311666045 - 2¹⁰ = 61545311665021 is a prime.

It is a super-2 number, since 2×61545311666045² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50814629 + ... + 52011701.

It is an arithmetic number, because the mean of its divisors is an integer number (1269956653416).

Almost surely, 2^{61545311666045} is an apocalyptic number.

It is an amenable number.

61545311666045 is a deficient number, since it is larger than the sum of its proper divisors (19731914152579).

61545311666045 is a wasteful number, since it uses less digits than its factorization.

61545311666045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197462.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 61545311666045 in words is "sixty-one trillion, five hundred forty-five billion, three hundred eleven million, six hundred sixty-six thousand, forty-five".