155387421856 has 12 divisors (see below), whose sum is σ = 305918986842. Its totient is φ = 77693710912.

The previous prime is 155387421853. The next prime is 155387421863. The reversal of 155387421856 is 658124783551.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 138000362256 + 17387059600 = 371484^2 + 131860^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155387421797 and 155387421806.

It is not an unprimeable number, because it can be changed into a prime (155387421853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2427928435 + ... + 2427928498.

Almost surely, 2^155387421856 is an apocalyptic number.

155387421856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155387421856 is a deficient number, since it is larger than the sum of its proper divisors (150531564986).

155387421856 is an equidigital number, since it uses as much as digits as its factorization.

155387421856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855856943 (or 4855856935 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 55.

The spelling of 155387421856 in words is "one hundred fifty-five billion, three hundred eighty-seven million, four hundred twenty-one thousand, eight hundred fifty-six".