1552787518397 has 4 divisors (see below), whose sum is σ = 1634513177280. Its totient is φ = 1471061859516.

The previous prime is 1552787518393. The next prime is 1552787518439. The reversal of 1552787518397 is 7938157872551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1552787518397 - 2² = 1552787518393 is a prime.

It is a super-2 number, since 2×1552787518397² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552787518393) 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, 40862829413 + ... + 40862829450.

It is an arithmetic number, because the mean of its divisors is an integer number (408628294320).

Almost surely, 2^{1552787518397} is an apocalyptic number.

It is an amenable number.

1552787518397 is a deficient number, since it is larger than the sum of its proper divisors (81725658883).

1552787518397 is an equidigital number, since it uses as much as digits as its factorization.

1552787518397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81725658882.

The product of its digits is 148176000, while the sum is 68.

The spelling of 1552787518397 in words is "one trillion, five hundred fifty-two billion, seven hundred eighty-seven million, five hundred eighteen thousand, three hundred ninety-seven".