6601501556251 has 16 divisors (see below), whose sum is σ = 7950609538560. Its totient is φ = 5354574171840.

The previous prime is 6601501556203. The next prime is 6601501556267. The reversal of 6601501556251 is 1526551051066.

It is a cyclic number.

It is not a de Polignac number, because 6601501556251 - 2¹⁹ = 6601501031963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6601501556198 and 6601501556207.

It is not an unprimeable number, because it can be changed into a prime (6601501554251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27861370 + ... + 28097311.

It is an arithmetic number, because the mean of its divisors is an integer number (496913096160).

Almost surely, 2^{6601501556251} is an apocalyptic number.

6601501556251 is a deficient number, since it is larger than the sum of its proper divisors (1349107982309).

6601501556251 is a wasteful number, since it uses less digits than its factorization.

6601501556251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55959594.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 6601501556251 in words is "six trillion, six hundred one billion, five hundred one million, five hundred fifty-six thousand, two hundred fifty-one".