221077450464 has 48 divisors (see below), whose sum is σ = 624968950032. Its totient is φ = 68023830528.

The previous prime is 221077450463. The next prime is 221077450481. The reversal of 221077450464 is 464054770122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221077450463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88571449 + ... + 88573944.

It is an arithmetic number, because the mean of its divisors is an integer number (13020186459).

Almost surely, 2^221077450464 is an apocalyptic number.

221077450464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221077450464 is an abundant number, since it is smaller than the sum of its proper divisors (403891499568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221077450464 is a wasteful number, since it uses less digits than its factorization.

221077450464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177145419 (or 177145411 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 42.

The spelling of 221077450464 in words is "two hundred twenty-one billion, seventy-seven million, four hundred fifty thousand, four hundred sixty-four".