1621772647407 has 24 divisors (see below), whose sum is σ = 2557740976128. Its totient is φ = 982038498000.

The previous prime is 1621772647393. The next prime is 1621772647447. The reversal of 1621772647407 is 7047462771261.

It is a happy number.

1621772647407 is a `hidden beast` number, since 1 + 6 + 2 + 177 + 2 + 64 + 7 + 407 = 666.

It is not a de Polignac number, because 1621772647407 - 2¹⁴ = 1621772631023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621772647447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7002273 + ... + 7230170.

It is an arithmetic number, because the mean of its divisors is an integer number (106572540672).

Almost surely, 2^{1621772647407} is an apocalyptic number.

1621772647407 is a deficient number, since it is larger than the sum of its proper divisors (935968328721).

1621772647407 is a wasteful number, since it uses less digits than its factorization.

1621772647407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14233611 (or 14233608 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 1621772647407 in words is "one trillion, six hundred twenty-one billion, seven hundred seventy-two million, six hundred forty-seven thousand, four hundred seven".