61426246720661 has 8 divisors (see below), whose sum is σ = 64674109029600. Its totient is φ = 58179874607280.

The previous prime is 61426246720651. The next prime is 61426246720673. The reversal of 61426246720661 is 16602764262416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61426246720661 - 2²² = 61426242526357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61426246720651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372464270 + ... + 372629151.

It is an arithmetic number, because the mean of its divisors is an integer number (8084263628700).

Almost surely, 2^{61426246720661} is an apocalyptic number.

It is an amenable number.

61426246720661 is a deficient number, since it is larger than the sum of its proper divisors (3247862308939).

61426246720661 is a wasteful number, since it uses less digits than its factorization.

61426246720661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745097779.

The product of its (nonzero) digits is 6967296, while the sum is 53.

The spelling of 61426246720661 in words is "sixty-one trillion, four hundred twenty-six billion, two hundred forty-six million, seven hundred twenty thousand, six hundred sixty-one".