1947865463551 has 32 divisors (see below), whose sum is σ = 2347846502400. Its totient is φ = 1614386819808.

The previous prime is 1947865463513. The next prime is 1947865463563. The reversal of 1947865463551 is 1553645687491.

It is not a de Polignac number, because 1947865463551 - 2⁹ = 1947865463039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947865463501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 610165 + ... + 2065921.

It is an arithmetic number, because the mean of its divisors is an integer number (73370203200).

Almost surely, 2^{1947865463551} is an apocalyptic number.

1947865463551 is a deficient number, since it is larger than the sum of its proper divisors (399981038849).

1947865463551 is an equidigital number, since it uses as much as digits as its factorization.

1947865463551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455908 (or 1455894 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 64.

The spelling of 1947865463551 in words is "one trillion, nine hundred forty-seven billion, eight hundred sixty-five million, four hundred sixty-three thousand, five hundred fifty-one".