61667912541 has 4 divisors (see below), whose sum is σ = 82223883392. Its totient is φ = 41111941692.

The previous prime is 61667912513. The next prime is 61667912561. The reversal of 61667912541 is 14521976616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61667912541 - 2¹⁵ = 61667879773 is a prime.

It is a super-3 number, since 3×61667912541³ (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 (61667912561) 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, 10277985421 + ... + 10277985426.

It is an arithmetic number, because the mean of its divisors is an integer number (20555970848).

Almost surely, 2^61667912541 is an apocalyptic number.

It is an amenable number.

61667912541 is a deficient number, since it is larger than the sum of its proper divisors (20555970851).

61667912541 is a wasteful number, since it uses less digits than its factorization.

61667912541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20555970850.

The product of its digits is 544320, while the sum is 48.

The spelling of 61667912541 in words is "sixty-one billion, six hundred sixty-seven million, nine hundred twelve thousand, five hundred forty-one".