61957750447 has 4 divisors (see below), whose sum is σ = 62973451336. Its totient is φ = 60942049560.

The previous prime is 61957750409. The next prime is 61957750523. The reversal of 61957750447 is 74405775916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61957750447 - 2¹⁹ = 61957226159 is a prime.

It is a super-3 number, since 3×61957750447³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61957750847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507850353 + ... + 507850474.

It is an arithmetic number, because the mean of its divisors is an integer number (15743362834).

Almost surely, 2^61957750447 is an apocalyptic number.

61957750447 is a deficient number, since it is larger than the sum of its proper divisors (1015700889).

61957750447 is a wasteful number, since it uses less digits than its factorization.

61957750447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015700888.

The product of its (nonzero) digits is 7408800, while the sum is 55.

The spelling of 61957750447 in words is "sixty-one billion, nine hundred fifty-seven million, seven hundred fifty thousand, four hundred forty-seven".