61545775317644 has 12 divisors (see below), whose sum is σ = 107710618128624. Its totient is φ = 30771312995184.

The previous prime is 61545775317643. The next prime is 61545775317667. The reversal of 61545775317644 is 44671357754516.

It is not an unprimeable number, because it can be changed into a prime (61545775317641) 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, 393577967 + ... + 393734310.

It is an arithmetic number, because the mean of its divisors is an integer number (8975884844052).

Almost surely, 2^{61545775317644} is an apocalyptic number.

It is an amenable number.

61545775317644 is a deficient number, since it is larger than the sum of its proper divisors (46164842810980).

61545775317644 is a wasteful number, since it uses less digits than its factorization.

61545775317644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787331824 (or 787331822 counting only the distinct ones).

The product of its digits is 296352000, while the sum is 65.

The spelling of 61545775317644 in words is "sixty-one trillion, five hundred forty-five billion, seven hundred seventy-five million, three hundred seventeen thousand, six hundred forty-four".