61758018311 has 4 divisors (see below), whose sum is σ = 67372383624. Its totient is φ = 56143653000.

The previous prime is 61758018281. The next prime is 61758018317. The reversal of 61758018311 is 11381085716.

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 61758018311 - 2³⁴ = 44578149127 is a prime.

It is a super-2 number, since 2×61758018311² (a number of 22 digits) contains 22 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 (61758018317) 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, 2807182640 + ... + 2807182661.

It is an arithmetic number, because the mean of its divisors is an integer number (16843095906).

Almost surely, 2^61758018311 is an apocalyptic number.

61758018311 is a deficient number, since it is larger than the sum of its proper divisors (5614365313).

61758018311 is a wasteful number, since it uses less digits than its factorization.

61758018311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614365312.

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 61758018311 in words is "sixty-one billion, seven hundred fifty-eight million, eighteen thousand, three hundred eleven".