61730781254758 has 24 divisors (see below), whose sum is σ = 117506088253224. Its totient is φ = 24050953735200.

The previous prime is 61730781254749. The next prime is 61730781254789. The reversal of 61730781254758 is 85745218703716.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61730781254758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28632086703 + ... + 28632088858.

It is an arithmetic number, because the mean of its divisors is an integer number (4896087010551).

Almost surely, 2^{61730781254758} is an apocalyptic number.

61730781254758 is a deficient number, since it is larger than the sum of its proper divisors (55775306998466).

61730781254758 is a wasteful number, since it uses less digits than its factorization.

61730781254758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57264175588 (or 57264175581 counting only the distinct ones).

The product of its (nonzero) digits is 79027200, while the sum is 64.

The spelling of 61730781254758 in words is "sixty-one trillion, seven hundred thirty billion, seven hundred eighty-one million, two hundred fifty-four thousand, seven hundred fifty-eight".