64040606606261 has 4 divisors (see below), whose sum is σ = 64284107011872. Its totient is φ = 63797106200652.

The previous prime is 64040606606161. The next prime is 64040606606293. The reversal of 64040606606261 is 16260660604046.

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 a cyclic number.

It is not a de Polignac number, because 64040606606261 - 2²² = 64040602411957 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 (64040606606161) 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, 121750202411 + ... + 121750202936.

It is an arithmetic number, because the mean of its divisors is an integer number (16071026752968).

Almost surely, 2^{64040606606261} is an apocalyptic number.

It is an amenable number.

64040606606261 is a deficient number, since it is larger than the sum of its proper divisors (243500405611).

64040606606261 is a wasteful number, since it uses less digits than its factorization.

64040606606261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243500405610.

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 64040606606261 in words is "sixty-four trillion, forty billion, six hundred six million, six hundred six thousand, two hundred sixty-one".