1621672237440 has 128 divisors (see below), whose sum is σ = 5743422568800. Its totient is φ = 432445925376.

The previous prime is 1621672237439. The next prime is 1621672237453. The reversal of 1621672237440 is 447322761261.

1621672237440 is a `hidden beast` number, since 1 + 6 + 216 + 7 + 22 + 374 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46906107 + ... + 46940666.

Almost surely, 2^{1621672237440} is an apocalyptic number.

1621672237440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621672237440 is an abundant number, since it is smaller than the sum of its proper divisors (4121750331360).

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

1621672237440 is an equidigital number, since it uses as much as digits as its factorization.

1621672237440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93846801 (or 93846783 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 1621672237440 in words is "one trillion, six hundred twenty-one billion, six hundred seventy-two million, two hundred thirty-seven thousand, four hundred forty".