61620361667 has 4 divisors (see below), whose sum is σ = 61627262496. Its totient is φ = 61613460840.

The previous prime is 61620361661. The next prime is 61620361739. The reversal of 61620361667 is 76616302616.

61620361667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61620361667 - 2¹⁰ = 61620360643 is a prime.

It is a super-3 number, since 3×61620361667³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61620361661) 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, 3437003 + ... + 3454884.

It is an arithmetic number, because the mean of its divisors is an integer number (15406815624).

Almost surely, 2^61620361667 is an apocalyptic number.

61620361667 is a deficient number, since it is larger than the sum of its proper divisors (6900829).

61620361667 is an equidigital number, since it uses as much as digits as its factorization.

61620361667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900828.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 61620361667 in words is "sixty-one billion, six hundred twenty million, three hundred sixty-one thousand, six hundred sixty-seven".