61749463545 has 288 divisors, whose sum is σ = 143505782784. Its totient is φ = 23959203840.

The previous prime is 61749463537. The next prime is 61749463547. The reversal of 61749463545 is 54536494716.

It is a happy number.

61749463545 is a `hidden beast` number, since 6 + 1 + 7 + 4 + 94 + 6 + 3 + 545 = 666.

It is not a de Polignac number, because 61749463545 - 2³ = 61749463537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61749463491 and 61749463500.

It is not an unprimeable number, because it can be changed into a prime (61749463547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 101728632 + ... + 101729238.

It is an arithmetic number, because the mean of its divisors is an integer number (498283968).

Almost surely, 2^61749463545 is an apocalyptic number.

It is an amenable number.

61749463545 is an abundant number, since it is smaller than the sum of its proper divisors (81756319239).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61749463545 is a wasteful number, since it uses less digits than its factorization.

61749463545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 807 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 61749463545 in words is "sixty-one billion, seven hundred forty-nine million, four hundred sixty-three thousand, five hundred forty-five".