1640550247157 has 4 divisors (see below), whose sum is σ = 1640553389196. Its totient is φ = 1640547105120.

The previous prime is 1640550247051. The next prime is 1640550247159. The reversal of 1640550247157 is 7517420550461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1527068176516 + 113482070641 = 1235746^2 + 336871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640550247157 - 2¹⁸ = 1640549985013 is a prime.

It is a super-3 number, since 3×1640550247157³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640550247159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 579038 + ... + 1901679.

It is an arithmetic number, because the mean of its divisors is an integer number (410138347299).

Almost surely, 2^{1640550247157} is an apocalyptic number.

It is an amenable number.

1640550247157 is a deficient number, since it is larger than the sum of its proper divisors (3142039).

1640550247157 is an equidigital number, since it uses as much as digits as its factorization.

1640550247157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142038.

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 1640550247157 in words is "one trillion, six hundred forty billion, five hundred fifty million, two hundred forty-seven thousand, one hundred fifty-seven".