6551221756354 has 64 divisors (see below), whose sum is σ = 10816793498880. Its totient is φ = 2951130193920.

The previous prime is 6551221756153. The next prime is 6551221756361. The reversal of 6551221756354 is 4536571221556.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1540374492 + ... + 1540378744.

It is an arithmetic number, because the mean of its divisors is an integer number (169012398420).

Almost surely, 2^{6551221756354} is an apocalyptic number.

6551221756354 is a deficient number, since it is larger than the sum of its proper divisors (4265571742526).

6551221756354 is a wasteful number, since it uses less digits than its factorization.

6551221756354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5755.

The product of its digits is 7560000, while the sum is 52.

The spelling of 6551221756354 in words is "six trillion, five hundred fifty-one billion, two hundred twenty-one million, seven hundred fifty-six thousand, three hundred fifty-four".